Objective To investigated the clinical value of J hook in higher traction by treatment of 40 gummy smile deep overbite patients.
目的通过对40例牙龈型微笑的深覆牙合患者的治疗，探讨J形钩高位牵引的临床应用。
The t-test and stepwise regression analysis were performed in both groups to determine the correlated factors of gummy smile deformity.
采用t检验及回归分析比较两组患者各参数的差异，并分析与微笑露龈畸形相关的因素。
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